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NO + O 3 → NO 2 + O 2. NO 2 + O(1 D) → NO + O 2. Net: O 3 + O(1 D) → 2O 2 (net loss of ozone) Null cycles can also occur in the troposphere. One example is the null cycle that occurs during the day between NO x and ozone. Tropospheric Null Cycle O 3 + NO → O 2 + NO 2. NO 2 + hν → NO + O(3 P) O (3 P) + O 2 + M → O 3 + M Net: hv → ...
The ozone layer peaks at 8 to 15 parts per million of ozone, [1] while the average ozone concentration in Earth's atmosphere as a whole is about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers (9 to 22 mi) above Earth, although its thickness varies ...
Following the ozone depletion in 1997 and 2011, a 90% drop in ozone was measured by weather balloons over the Arctic in March 2020, as they normally recorded 3.5 parts per million of ozone, compared to only around 0.3 parts per million lastly, due to the coldest temperatures ever recorded since 1979, and a strong polar vortex which allowed ...
NO 2 also reacts with ozone to form nitrate radical NO 2 + O 3 → NO 3 + O 2. During the daytime, NO 3 is quickly photolyzed back to NO 2, but at night it can react with a second NO 2 to form dinitrogen pentoxide. NO 2 + NO 3 (+M) → N 2 O 5 (+M). N 2 O 5 reacts rapidly with liquid water (in aerosol particles or cloud drops, but not in the ...
Ozone in the ozone layer filters out sunlight wavelengths from about 200 nm UV rays to 315 nm, with ozone peak absorption at about 250 nm. [55] This ozone UV absorption is important to life, since it extends the absorption of UV by ordinary oxygen and nitrogen in air (which absorb all wavelengths < 200 nm) through the lower UV-C (200–280 nm ...
This series of reactions creates a null cycle, in which there is no net production or loss of any species involved. Since O(3 P) is very reactive and O 2 is abundant, O(3 P) can be assumed to be in steady state, and thus an equation linking the concentrations of the species involved can be derived, giving the Leighton relationship: [2] [3]
FILE - In this NASA false-color image, the blue and purple shows the hole in Earth's protective ozone layer over Antarctica on Oct. 5, 2022. Earth’s protective ozone layer is slowly but ...
It plays an important role in the process of ozone depletion. In the stratosphere, chlorine atoms react with ozone molecules to form chlorine monoxide and oxygen. Cl • + O 3 → ClO • + O 2. This reaction causes the depletion of the ozone layer. [1] The resulting ClO • radicals can further react: ClO • + O • → Cl • + O 2 ...